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Erysipelas

(Science: dermatology) An acute superficial form of cellulitis involving the dermal lymphatics, usually caused by infection with group a streptococci and chiefly characterised by a peripherally spreading hot, bright red, oedematous, brawny, infiltrated and sharply circumscribed plaque with a raised indurated border. Formerly called St. Anthony's fire.

Compare: cellulitis, phlegmon.